const app = require('express').Router();
const crypto = require('crypto');
const checkPermission = require("../middlewares/checkPermission");
const giftValidation = require("../validation/giftValidation");
const Article = require("../models/Article");
const Gift = require("../models/Gift");
const ActivatedArticle = require("../models/ActivatedArticle");

app.put("/", checkPermission("admin.gift.create"), async (req, res) => {
    // Validate request
    const {error} = giftValidation.create.validate(req.body);
    if (error) return res.status(400).json({message: error.details[0].message});

    // Set optional fields
    const giftID = (req.body.giftID || crypto.randomBytes(15).toString("hex")).toUpperCase();
    const expiry_date = new Date(req.body.expiry_date || new Date("4000-01-01"));
    const item_expiry_date = new Date(req.body.item_expiry_date || new Date("4000-01-01"));

    // Check if article exists
    const {count: articleCount} = await Article.findAndCountAll({where: {id: req.body.articleID}});
    if (articleCount === 0) return res.status(400).json({message: "Article does not exist"});

    // Check if code already exists
    const {count: codeCount} = await Gift.findAndCountAll({where: {giftID: giftID}});
    if (codeCount === 1) return res.status(400).json({message: "Code already exists"});

    // Create gift
    await Gift.create({
        giftID: giftID,
        articleID: req.body.articleID,
        expiry_date: expiry_date,
        item_expiry_date: item_expiry_date
    });

    // Return gift
    res.status(200).json({
        giftID: giftID, articleID: req.body.articleID,
        expiry_date: expiry_date.toISOString(), item_expiry_date: item_expiry_date.toISOString()
    });
});

app.get("/:giftID", checkPermission("admin.gift.info"), async (req, res) => {
    // Validate request
    if (!req.params.giftID) return res.status(400).json({message: "Gift ID is required"});

    // Check if code is in database
    const giftInfo = await Gift.findOne({where: {giftID: req.params.giftID}});

    // Return info
    if (giftInfo)
        res.status(200).json(giftInfo);
    else res.status(404).json({message: "Gift not found"});
});

app.delete("/:giftID", checkPermission("admin.gift.delete"), async (req, res) => {
    // Validate request
    if (!req.params.giftID) return res.status(400).json({message: "Gift ID is required"});

    // Check if code exists
    const {count} = await Gift.findAndCountAll({where: {giftID: req.params.giftID}});
    if (count === 0) return res.status(400).json({message: "Gift not found"});

    // Delete code
    await Gift.destroy({where: {giftID: req.params.giftID}});

    // Send response
    res.status(200).json({message: "Gift successfully deleted"});
});

app.patch("/", checkPermission("admin.gift.update"), async (req, res) => {
    // Validate request
    const {error} = giftValidation.update.validate(req.body);
    if (error) return res.status(400).json({message: error.details[0].message});

    // Check if code exists
    const {count} = await Gift.findAndCountAll({where: {giftID: req.body.giftID}});
    if (count === 0) return res.status(400).json({message: "Gift not found"});

    // Add changes to object
    const updatedGift = {};
    if (req.body.articleID) {

        // Check if article exists
        const {count: articleCount} = await Article.findAndCountAll({where: {articleID: req.body.articleID}});
        if (articleCount === 0) return res.status(400).json({message: "Article does not exist"});
        updatedGift["articleID"] = req.body.articleID;
    }
    if (req.body.expiry_date) updatedGift["expiry_date"] = req.body.expiry_date;
    if (req.body.item_expiry_date) updatedGift["item_expiry_date"] = req.body.item_expiry_date;

    // Update
    await Gift.update(updatedGift, {where: {giftID: req.body.giftID}});

    // Send response
    res.status(200).json({message: "Gift updated successfully"});
});

app.post("/redeem", async (req, res) => {
    // Validate request
    const {error} = giftValidation.redeem.validate(req.body);
    if (error) return res.status(400).json({message: error.details[0].message});

    // Check if code is in database
    const giftInfo = await Gift.findOne({where: {giftID: req.body.giftID}});

    // Check if gift exists
    if (!giftInfo) return res.status(404).json({message: "Gift not found"});

    // Get the article
    const article = await Article.findOne({where: {id: giftInfo.articleID}});

    // Check if article limit reached
    const {count} = await ActivatedArticle.findAndCountAll({
        where: {
            articleID: giftInfo.articleID,
            guildID: req.body.guildID
        }
    });

    if (count >= article.maxOwnCount) return res.status(400).json({message: "Maximum limit of this item reached"});

    // Redeem article
    await ActivatedArticle.create({
        articleID: giftInfo.articleID,
        expiry_date: giftInfo.item_expiry_date,
        guildID: req.body.guildID
    });
    await Gift.destroy({where: {giftID: req.body.giftID}});

    // Send response
    res.json({message: "Article successfully redeemed"});
});


module.exports = app;